Precious stone testing apparatus



FIG. 1 is a perspective view of precious stone testing apparatus showing my new design.

FIG. 2 is a left view thereof.

FIG. 3 is a right view thereof.

FIG. 4 is a front end view thereof.

FIG. 5 is a rear view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for a precious stone testing apparatus, as shown and described. 